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 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package javax.swing.plaf.synth;

import javax.swing.*;
import javax.swing.text.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicTextAreaUI;
import java.awt.*;
import java.awt.event.FocusListener;
import java.awt.event.FocusEvent;
import java.beans.PropertyChangeEvent;

/**
 * Provides the look and feel for a plain text editor in the
 * Synth look and feel. In this implementation the default UI
 * is extended to act as a simple view factory.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @author Shannon Hickey
 * @since 1.7
 */
public class SynthTextAreaUI extends BasicTextAreaUI implements SynthUI {

  private Handler handler = new Handler();
  private SynthStyle style;

  /**
   * Creates a UI object for a JTextArea.
   *
   * @param ta a text area
   * @return the UI object
   */
  public static ComponentUI createUI(JComponent ta) {
    return new SynthTextAreaUI();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void installDefaults() {
    // Installs the text cursor on the component
    super.installDefaults();
    updateStyle(getComponent());
    getComponent().addFocusListener(handler);
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void uninstallDefaults() {
    SynthContext context = getContext(getComponent(), ENABLED);

    getComponent().putClientProperty("caretAspectRatio", null);
    getComponent().removeFocusListener(handler);

    style.uninstallDefaults(context);
    context.dispose();
    style = null;
    super.uninstallDefaults();
  }

  private void updateStyle(JTextComponent comp) {
    SynthContext context = getContext(comp, ENABLED);
    SynthStyle oldStyle = style;

    style = SynthLookAndFeel.updateStyle(context, this);

    if (style != oldStyle) {
      SynthTextFieldUI.updateStyle(comp, context, getPropertyPrefix());

      if (oldStyle != null) {
        uninstallKeyboardActions();
        installKeyboardActions();
      }
    }
    context.dispose();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public SynthContext getContext(JComponent c) {
    return getContext(c, SynthLookAndFeel.getComponentState(c));
  }

  private SynthContext getContext(JComponent c, int state) {
    return SynthContext.getContext(c, style, state);
  }

  /**
   * Notifies this UI delegate to repaint the specified component.
   * This method paints the component background, then calls
   * the {@link #paint(SynthContext, Graphics)} method.
   *
   * <p>In general, this method does not need to be overridden by subclasses.
   * All Look and Feel rendering code should reside in the {@code paint} method.
   *
   * @param g the {@code Graphics} object used for painting
   * @param c the component being painted
   * @see #paint(SynthContext, Graphics)
   */
  @Override
  public void update(Graphics g, JComponent c) {
    SynthContext context = getContext(c);

    SynthLookAndFeel.update(context, g);
    context.getPainter().paintTextAreaBackground(context,
        g, 0, 0, c.getWidth(), c.getHeight());
    paint(context, g);
    context.dispose();
  }

  /**
   * Paints the specified component.
   *
   * @param context context for the component being painted
   * @param g the {@code Graphics} object used for painting
   * @see #update(Graphics, JComponent)
   */
  protected void paint(SynthContext context, Graphics g) {
    super.paint(g, getComponent());
  }

  /**
   * {@inheritDoc}
   *
   * Overridden to do nothing.
   */
  @Override
  protected void paintBackground(Graphics g) {
    // Overriden to do nothing, all our painting is done from update/paint.
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void paintBorder(SynthContext context, Graphics g, int x,
      int y, int w, int h) {
    context.getPainter().paintTextAreaBorder(context, g, x, y, w, h);
  }

  /**
   * This method gets called when a bound property is changed
   * on the associated JTextComponent.  This is a hook
   * which UI implementations may change to reflect how the
   * UI displays bound properties of JTextComponent subclasses.
   * This is implemented to rebuild the View when the
   * <em>WrapLine</em> or the <em>WrapStyleWord</em> property changes.
   *
   * @param evt the property change event
   */
  @Override
  protected void propertyChange(PropertyChangeEvent evt) {
    if (SynthLookAndFeel.shouldUpdateStyle(evt)) {
      updateStyle((JTextComponent) evt.getSource());
    }
    super.propertyChange(evt);
  }

  private final class Handler implements FocusListener {

    public void focusGained(FocusEvent e) {
      getComponent().repaint();
    }

    public void focusLost(FocusEvent e) {
      getComponent().repaint();
    }
  }
}
